Analysis by: Raighen Sanchez
ALIASES:

Trj/RansomGen.A (PANDA)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size: 415,232 bytes
File Type: EXE
Initial Samples Received Date: 02 Oct 2023
Payload: Collects system information, Encrypts files

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Ransomware adds the following processes:

  • vssadmin delete shadows /all /quiet → used to delete shadow copies
  • ping 1.1.1.1 -n 3 -w 5000

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Global\WLm87eV1oNRx6P3E4Cy9

Information Theft

This Ransomware gathers the following data:

  • OS Version
  • Username
  • Hostname
  • Number of Processors
  • Disk Information

Other Details

This Ransomware does the following:

  • It encrypts fixed drives, removable drives, and network shares.

It accepts the following parameters:

  • Required to proceed to its encryption routine:
    • -id {victim ID}
  • -path {target path} → specify directory to encrypt
  • -ep → define encryption parameter
  • -vmonly → encrypt all files
  • -logs → display terminal logs
  • -stopvm → terminates VM processes
  • -fork → creates a child process of itself

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file name:

  • bootsect.bak
  • autorun.inf
  • iconcache.db
  • thumbs.db
  • ntuser.ini
  • boot.ini
  • bootfont.bin
  • ntuser.dat
  • ntuser.dat.log
  • ntldr
  • desktop.ini
  • readme.blacksuit.txt

It appends the following extension to the file name of the encrypted files:

  • {Original filename}.{Original extension}.blacksuit

It drops the following file(s) as ransom note:

  • {All available drives}\readme.blacksuit.txt
  • {Encrypted directory}\readme.blacksuit.txt
  • {malware path}\readme.blacksuit.txt

It avoids encrypting files with the following file extensions:

  • com
  • ani
  • scr
  • drv
  • hta
  • rom
  • bin
  • msc
  • ps1
  • diagpkg
  • shs
  • adv
  • msu
  • cp
  • prf
  • bat
  • idx
  • mpa
  • cmd
  • msi
  • mod
  • ocx
  • icns
  • ics
  • sp
  • 386
  • lock
  • sys
  • rtp
  • wpx
  • diagcab
  • theme
  • deskthemepack
  • msp
  • cab
  • ldf
  • nomedia
  • ic
  • lnk
  • cur
  • dll
  • nls
  • themepack
  • msstyles
  • hlp
  • key
  • ico
  • exe
  • diagcfg
  • blacksuit

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.732.08
FIRST VSAPI PATTERN DATE: 02 Oct 2023
VSAPI OPR PATTERN File: 18.733.00
VSAPI OPR PATTERN Date: 03 Oct 2023

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    •  Troj.Win32.TRX.XXPE50FFF073

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

  • {All available drives}\readme.blacksuit.txt
  • {Encrypted directory}\readme.blacksuit.txt
  • {malware path}\readme.blacksuit.txt

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.BLACKSUIT.YPDJB. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:

Step 6

Restore encrypted files from backup.


Did this description help? Tell us how we did.